Post Syndicated from original https://lwn.net/Articles/911281/

The QEMU emulator has a sizable set of
storage features, including disk-image file formats like qcow2, snapshots,
incremental backup, and storage migration, which are available to virtual
machines. This software-defined storage functionality that is available
inside QEMU has not
been easily
accessible outside of it, however. Kevin Wolf and Stefano Garzarella
presented at
KVM Forum
2022 on the new qemu-storage-daemon program and the libblkio
library that make QEMU’s storage functionality available even when the goal
is not
to run a virtual machine (VM).